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Old 12-05-2011, 01:53 PM   #16
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Garage ceiling insulation

By the way...if anyone can show me an 30-year shingle that has made it that long...you will be the first.

You will forgive me if I take every shingle manufacturer's warranty claims and exclusions with a grain of salt.

Interesting that the most significant piece of evidence for shingle degradation was...

Perhaps the most rigorous analysis of the impact of attic ventilation on shingle life comes from work
sponsored by the Certainteed Corporation (Shiao et al, 2003) in which the authors developed a mathematical model of cumulative shingle damage to evaluate the kinetics of roofing material degradation. Again, this work showed that fundamental increases to molecular activity were the fundamental driving force in reducing shingle life expectancy. In particularly, the high temperature history in a hot climate was showed accelerated aging of composition shingles. For instance, the higher temperatures in a hot climate such as Miami, were shown to accelerate aging during during winter months at a rate about 10 times faster than in Minneapolis. The effect of attic ventilation was found to reduce the uneven distribution of cumulative damage across the roof deck due to unbalanced thermal regimes in the unvented roof deck as well as to reduce the times at higher temperatures. The work did not look at how no ventilation and an insulated roof deck would influence the time-temperature history, but there is little doubt that such an evaluation would find even larger differences in the rate of cumulative shingle aging (Shiao, 2005).

Again, the point being that region has much more impact that ventilated vs. sealed.

Last edited by Windows on Wash; 12-05-2011 at 01:58 PM.
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Old 12-05-2011, 02:57 PM   #17
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Garage ceiling insulation

Good read on cathedral ceilings and attic venting.


Unvented-cathedralized attics: Where we’ve been and where we’re going

Roof Ventilation Update

Last edited by Windows on Wash; 12-05-2011 at 03:07 PM. Reason: added links
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